If C1 and C2 are the capacitance used in Colpitts oscillator the effective capacitance in the equation of frequency calculation is equal to ___________(a) (ᴨ×C1×C2)/(C1+C2)(b) 3 (C1×C2)/(C1+C2)(c) (C1×C2)/(2ᴨ(C1+C2))(d) (C1×C2)/(C1+C2)This question was posed to me in final exam.The query is from Colpitts Oscillator-2 in chapter Oscillators of Analog Circuits

If C1 and C2 are the capacitance used in Colpitts oscillator the effec

1.	If C1 and C2 are the capacitance used in Colpitts oscillator the effective capacitance in the equation of frequency calculation is equal to ___________(a) (ᴨ×C1×C2)/(C1+C2)(b) 3 (C1×C2)/(C1+C2)(c) (C1×C2)/(2ᴨ(C1+C2))(d) (C1×C2)/(C1+C2)This question was posed to me in final exam.The query is from Colpitts Oscillator-2 in chapter Oscillators of Analog Circuits
Answer» RIGHT OPTION is (d) (C1×C2)/(C1+C2) Easiest explanation: In the tank circuit of Colpitts OSCILLATOR there are two capacitors CONNECTED in series and hence EFFECTIVE capacitance is (C1×C2)/(C1+C2).

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